I am 6 weeks out from RC/Neobladder for T1/G3 & CIS, and things are going fairly well. Catheter came out at 3 weeks. However, for about a week now, I have noticed intermittent lower back pain/ache, but otherwise no suggestion of infection (fevers, feeling unwell etc.). Is this common? I had un ultrasound scan which ruled out a 'fixed' obstruction. My feeling is that this may be related to the still small neobladder filling, and the increasing pressure giving rise to a bit of reflux back up the ureters to the kidney. Is this backache common?